Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16277#discussion_r92331760
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala 
---
    @@ -557,9 +562,10 @@ abstract class TreeNode[BaseType <: 
TreeNode[BaseType]] extends Product {
         }
     
         if (children.nonEmpty) {
    -      children.init.foreach(
    -        _.generateTreeString(depth + 1, lastChildren :+ false, builder, 
verbose, prefix))
    -      children.last.generateTreeString(depth + 1, lastChildren :+ true, 
builder, verbose, prefix)
    +      children.init.foreach(_.generateTreeString(
    --- End diff --
    
    i re-arranged this so it looks exactly the same as the way we traverse 
innerChildren to make it more obvious.



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